If you are planning on replacing plug wires on a Discovery this solution will help. This task requires minimal tools, with fair to moderate mechanical skills. I'm not going to do a step by step instruction, but just point out some things to be aware of. 1) Coolant pipe in to manifold must be removed. It has a small o-ring you may want to replace . Removal caused minimal coolant loss. 2) You may have to loosen th 8mm bolts at the lower portion of the coil bracket and let it lean towards the firewall, this will allow for easier installation of the air plenum. 3) The black bracket which sits on top of the coil bracket and holds the secondary air pipe can be assembled onto the secondary air pipe loosely prior to installing the air plenum.4) Wire Loom : Utilize these looms to preset layout order of the wires. Attach to secondary air pipe. This will allow for an easy install into the looms on the rear of the air plenum, since they'll be in order. 5) A little bit of Nye Lubricant on the o-ring for the coolant pipe.Hope this helps.Take care..

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go to the library they will have a book for your truck that will show you the plug wire location for the distributor and distributor rotation and firing order and cylinder position on the engine. is this is all you need.

Inspect for the correct routing of the spark plug wires. Improper routing may cause cross-firing. Inspect each wire for any signs of cranks or splits in the wire. Inspect each plug wire boot for tearing, piercing, arcing, carbon tracking or a corroded terminal.
If there is any corrosion, carbon tracking or arcing indicated on a plug wire boot or terminal, both the plug wire and component it was connected to should be replaced.

if the other coils are functioning, then voltage to the coil pack is ok. removing the spark plug wire from the suspected bad coil with no change in engine performance is a reliable procedure to check for a bad coil.

Before servicing the vehicle, refer to the Precautions Section.NOTETwist the spark plug boot one-half turn in order to release the
boot. Pull on the spark plug boot only. Do not pull on the spark plug
wire or the wire could be damaged.

It is a coil on plug system. The Red or Red/Striped wire is the control of the primary winding from the ECM. The BLK/ORG wire is the ground side of the primary winding. The BLK/BLU wire is the secondary winding wire.

ONLY USE DENSO SPARK PLUGS IN A 2000 PASSPORT. If you use aftermarket plugs, the crankshaft sensor tends to detect it as a signal to the computer, and for some reason it resets the computer. Seen it happen more than once.